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I've sold Amazon and Best Buy gift cards for more than face value on eBay.

Probably more obvious though if you're moving a ton of gift cards on eBay.

Seems like that'd be a tricky proposition. There are a lot of people who would be happy to buy your $500 gift cards at $450.

But does this scale ? People seeking to launder money reckon in large sums.

I'd agree. should I ever have thought about ways to launder money, it's the ability to scale, not so much the % that's important.